607445

Appears in sequences

• One-half of number of permutations of [n] with exactly one run of adjacent symbols differing by 1.at n=9A000239
• Irregular triangle read by rows: T(n,k) (n >= 1, 0 <= k <= [n/2]) = number of permutations of 1..n with [n/2]-k runs of consecutive pairs up and down (divided by 2).at n=33A010030
• Number of rooted trees with n nodes and 4 leaves.at n=27A055279